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Computer ranbdomly shuts down

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Switch on computer tower and screen. Screen brings up LG logo and 'Activating power saving' then the screen shuts down. The tower continues to load Windows etc but I can't see a thing as the screen is black. I had connected it to a new tower which had Windows 7 on it although in the end I discovered the hard drive was faulty. Went back to my old tower with XP on it and discovered the above problem. Tried an old screen which wouldn't come on at all.

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Blue Screen Tried to update drivers. While updating .... I got a blue screen with a crash dump. Laptop shutdown and restarted. I chose the start windows in safe mode to check things out. I only saw one driver problem. Restarted laptop. It's moving slowly. Could memory be an issue? I've never upgraded the memory. My Acer 4520 displayed the "blue screen" and now it won't load up at all...the screen remains black. What can I do?

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Computer crashes on startup, goes to system repair

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Vl1918 it poweres on and shuts off.repeat

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HP Pavilion dv6810us does not start...

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Toshiba Equium A210 Laptop and the screen keeps on going blank

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Vista wont let me log in

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Screen Wiggles, CPU Shuts Self Off, Powers Up Very Slowly

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Computer restarts on own and thats all it does.

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System Errors - WiFi connectivity

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